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Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost $ 272,744 $ 259,726
Available-for-Sale Securities, Gross Unrealized Gains 1,943 2,886
Available-for-Sale Securities, Gross Unrealized Losses (4,577) (1,962)
Available-for-Sale Securities, Fair Value 270,110 260,650
Held-to-Maturity Securities    
Held-to-Maturity Securities, Amortized Cost [1] 642 648
Held-to-Maturity Securities, Gross Unrealized Gains [1] 0 1
Held-to-Maturity Securities, Gross Unrealized Losses [1] 0 0
Held-to-Maturity Securities, Fair Value [1] 642 649
Obligations of U.S. government corporations and agencies [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost 2,518 518
Available-for-Sale Securities, Gross Unrealized Gains 0 0
Available-for-Sale Securities, Gross Unrealized Losses (17) (10)
Available-for-Sale Securities, Fair Value 2,501 508
Mortgage-backed securities - residential [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost 64,093 59,942
Available-for-Sale Securities, Gross Unrealized Gains 57 90
Available-for-Sale Securities, Gross Unrealized Losses (1,732) (763)
Available-for-Sale Securities, Fair Value 62,418 59,269
REMICs [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost 1,025 1,072
Available-for-Sale Securities, Gross Unrealized Gains 0 0
Available-for-Sale Securities, Gross Unrealized Losses (5) (7)
Available-for-Sale Securities, Fair Value 1,020 1,065
Collateralized mortgage obligations [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost 97,115 94,588
Available-for-Sale Securities, Gross Unrealized Gains 46 180
Available-for-Sale Securities, Gross Unrealized Losses (1,969) (892)
Available-for-Sale Securities, Fair Value 95,192 93,876
Preferred stock [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost   0
Available-for-Sale Securities, Gross Unrealized Gains   1
Available-for-Sale Securities, Gross Unrealized Losses   0
Available-for-Sale Securities, Fair Value   1
Corporate bonds [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost 12,913 12,914
Available-for-Sale Securities, Gross Unrealized Gains 129 189
Available-for-Sale Securities, Gross Unrealized Losses 0 0
Available-for-Sale Securities, Fair Value 13,042 13,103
Obligations of state and political subdivisions [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost 95,080 90,692
Available-for-Sale Securities, Gross Unrealized Gains 1,711 2,426
Available-for-Sale Securities, Gross Unrealized Losses (854) (290)
Available-for-Sale Securities, Fair Value 95,937 92,828
Held-to-Maturity Securities    
Held-to-Maturity Securities, Amortized Cost [1] 580 580
Held-to-Maturity Securities, Gross Unrealized Gains [1] 0 0
Held-to-Maturity Securities, Gross Unrealized Losses [1] 0 0
Held-to-Maturity Securities, Fair Value [1] 580 580
FHLMC certificates [Member]    
Held-to-Maturity Securities    
Held-to-Maturity Securities, Amortized Cost [1] 9 10
Held-to-Maturity Securities, Gross Unrealized Gains [1] 0 0
Held-to-Maturity Securities, Gross Unrealized Losses [1] 0 0
Held-to-Maturity Securities, Fair Value [1] 9 10
FNMA certificates [Member]    
Held-to-Maturity Securities    
Held-to-Maturity Securities, Amortized Cost [1] 38 41
Held-to-Maturity Securities, Gross Unrealized Gains [1] 0 1
Held-to-Maturity Securities, Gross Unrealized Losses [1] 0 0
Held-to-Maturity Securities, Fair Value [1] 38 42
GNMA certificates [Member]    
Held-to-Maturity Securities    
Held-to-Maturity Securities, Amortized Cost [1] 15 17
Held-to-Maturity Securities, Gross Unrealized Gains [1] 0 0
Held-to-Maturity Securities, Gross Unrealized Losses [1] 0 0
Held-to-Maturity Securities, Fair Value [1] $ 15 $ 17
[1] FHLMC, FNMA, and GNMA certificates are residential mortgage-backed securities.